100% local processing — your files and data never leave this browser. No uploads, no server storage.

OnboxTools

PDF Tools

Certified Utility Suite

Access our specialized collection of pdf tools. Built for security and performance, these tools process all data locally.

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Compress PDF

Reduce the file size of your PDF documents while maintaining optimal visual quality.

Launch Compress PDF
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DPI Checker

Check DPI of JPG, PNG, and PDF files online — test image resolution and embedded scan quality locally.

Launch DPI Checker
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DPI Converter

Change DPI of images and PDFs online — convert to 300 DPI, 200 DPI, or custom resolution locally.

Launch DPI Converter
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JPG to PDF

Combine JPG and PNG photos into one PDF — merge multiple images locally, no upload.

Launch JPG to PDF
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Merge PDF files

Combine multiple PDF files into one document in the exact order you want.

Launch Merge PDF files
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Organize PDF

Rearrange, sort, and organize PDF pages visually to create a perfectly structured document.

Launch Organize PDF
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PDF Editor

Edit PDFs in your browser — add text, highlights, whiteout, reorder pages, and download.

Launch PDF Editor
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PDF OCR

OCR scanned PDFs and images in your browser — highlight words on the page, no upload.

Launch PDF OCR
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PDF Page Counter

Count PDF pages online instantly — how many pages in pdf, file size, metadata.

Launch PDF Page Counter
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PDF to JPG

Convert PDF pages into high-quality JPG images online — free, private, no upload.

Launch PDF to JPG
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PDF Viewer

Open and read PDFs in your browser — page navigation, zoom, rotate, print, and export pages as PNG.

Launch PDF Viewer
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PDF Word Counter

PDF word count online — count words and characters in PDF text, in your browser.

Launch PDF Word Counter
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Protect PDF

Secure your documents by adding a strong password and encryption to your PDF files.

Launch Protect PDF
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Rotate PDF

Permanently rotate specific pages or the entire PDF document with a single click.

Launch Rotate PDF
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Split PDF

Extract specific pages or split your PDF into multiple documents instantly.

Launch Split PDF
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Unlock PDF

Remove password protection from PDF files when you know the password. Unlock locally for editing, merging, or printing.

Launch Unlock PDF

Professional PDF Management: Architecture and Optimization

Portable Document Format (PDF) technology, governed by ISO 32000, is more than just a visual container; it is a complex hierarchical structure of objects. Our online suite interacts directly with the PDF cross-reference table (XREF) to perform non-destructive edits. By utilizing local-first processing, we avoid the heavy overhead of server-side PostScript rendering. When you merge or split files, our engine handles the underlying 'trailer' and 'catalog' dictionaries to ensure document integrity. Compression utilities within this suite utilize FlateDecode algorithms to strip redundant metadata and optimize stream objects without compromising the visual fidelity of embedded font subsets or vector paths. This is essential for maintaining compliance with PDF/A standards for long-term archiving while ensuring the smallest possible footprint for web distribution.

PDF Tools FAQ

How does browser-side PDF merging work?

We use a JavaScript binary parser to read the file structure, re-map object IDs, and generate a new XREF table entirely in your browser's memory.

Is there a risk of font corruption during rotation?

No. Our tools only modify the 'Rotate' attribute in the Page dictionary, leaving the content streams and font resources untouched.

Are the compressed files PDF/A compliant?

Yes, our compression maintains the internal structure required for PDF/A standards while removing non-essential metadata.